List 组合排序 请给简单源代码

[_三皮_]

现有List<Matter>=new List<Matter>
Matter中的属性有
ProviderName
MaClass
MaName
MaSize
如果要求将List中的数据按照ProviderName,MaClass,MaName,MaSize的顺序排列
代码要如何写

[haiwangstar]

simply use List.Sort ,but before use List.Sort ,you should let Matter implement IComparer interface

[TNT_1st_excellence]

你List里面的资料是绑定数据库的吗？如果是，new DataView 先把DataTable里面的资料按照ProviderName,MaClass,MaName,MaSize的顺序排列就可以了,然后用DataView 绑定List，可能我的理解跟你讲得有偏差。

[he_8134]

随便写写～仅供参考～～

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    public class Matter
    {
        public string ProviderName;
        public int MaClass;
        public string MaName;
        public int MaSize;
        public override string ToString()
        {
            return string.Format("ProviderName:{0}，MaClass:{1}，MaName:{2}，MaSize:{3}", ProviderName, MaClass, MaName, MaSize);
        }
    }
    public enum MatterComparerType {
        ProviderName, MaClass, MaName, MaSize
    }
    public enum SortOder {
        Ascending,Descending
    }
    public class MatterComparer : IComparer<Matter>
    {
        public MatterComparerType Orderby;
        public SortOder Order;
        public MatterComparer(MatterComparerType orderby,SortOder order)
        {
            this.Orderby = orderby;
            this.Order = order;
        }
        int CompareByProviderName(Matter x, Matter y) {
            if (Order == SortOder.Ascending) return string.Compare(y.ProviderName, x.ProviderName);
            return string.Compare(x.ProviderName, y.ProviderName);
        }
        int CompareByMaClass(Matter x, Matter y) {
            if (Order == SortOder.Ascending) return y.MaClass - x.MaClass;
            return x.MaClass - y.MaClass;
        }
        int CompareByMaName(Matter x, Matter y) {
            if (Order == SortOder.Ascending) return string.Compare(y.MaName, x.MaName);
            return string.Compare(x.MaName, y.MaName);
        }
        int CompareByMaSize(Matter x, Matter y) {
            if (Order == SortOder.Ascending) return y.MaSize - x.MaSize;
            return x.MaSize - y.MaSize;
        }
        #region IComparer<Matter> 成员

        public int Compare(Matter x, Matter y)
        {
            switch (this.Orderby) {
                case MatterComparerType.ProviderName: return CompareByProviderName(x, y);
                case MatterComparerType.MaClass: return CompareByMaClass(x, y);
                case MatterComparerType.MaName: return CompareByMaName(x, y);
                case MatterComparerType.MaSize: return CompareByMaSize(x, y);
            }
            return 0;
        }

        #endregion
    }
    class Program
    {
        static void Main(string[] args)
        {
            List<Matter> list = new List<Matter>();
            Matter m = new Matter();
            m.ProviderName = "MS1";
            m.MaClass = 111;
            m.MaName = "CK5";
            m.MaSize = 123;
            list.Add(m);
            m = new Matter();
            m.ProviderName = "MS2";
            m.MaClass = 13;
            m.MaName = "CK4";
            m.MaSize = 12213;
            list.Add(m);
            m = new Matter();
            m.ProviderName = "MS3";
            m.MaClass = 12;
            m.MaName = "CK3";
            m.MaSize = 1233;
            list.Add(m);
            m = new Matter();
            m.ProviderName = "MS3";
            m.MaClass = 1;
            m.MaName = "CK2";
            m.MaSize = 1123;
            list.Add(m);
            m = new Matter();
            m.ProviderName = "MS5";
            m.MaClass = 23;
            m.MaName = "CK1";
            m.MaSize = 123;
            list.Add(m);
            MatterComparer mc1 = new MatterComparer(MatterComparerType.MaSize,SortOder.Descending);
            MatterComparer mc2 = new MatterComparer(MatterComparerType.MaName, SortOder.Descending);
            MatterComparer mc3 = new MatterComparer(MatterComparerType.MaClass, SortOder.Descending);
            MatterComparer mc4 = new MatterComparer(MatterComparerType.ProviderName, SortOder.Descending);
            list.Sort(mc1);
            list.Sort(mc2);
            list.Sort(mc3);
            list.Sort(mc4);
            foreach (Matter ma in list)
            {
                Console.WriteLine(ma);
            }
            Console.Read();
        }
    }
}

[changjiangzhibin]

呵呵

[_三皮_]

我是数据库表->实体类->List->界面grid控件, 控件不能组合排序，实体类比表有多个扩展字段，实体类的属性特别多。排序字段和顺序是经常变化的，速度也要可以忍受（按点击grid的列头顺序进行组合排序）。要实现组合排序，有没有方案？
如果改为数据源直接绑表，代价太大了，又不是oo,维护也不方便。

[he_8134]

Linq
两三行搞定。。。